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HOMESERVICE MANUALSBUICK2000REGAL GSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START - ENGINE CRANKS OKAY (3.1L & 3.4L)FUEL PUMP ELECTRICAL CIRCUIT
2000 Buick Regal GS

Fuel Pump Electrical Circuit

2000 Buick Regal GSSECTION Fuel Pump Electrical Circuit
  1. Perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Connect scan tool. Turn ignition on. Using scan tool, command fuel pump on and off. If fuel pump turns on and off, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article. If fuel pump does not turn on and off, go to next step.
  3. Using scan tool, command fuel pump on and off. If fuel pump relay clicks, go to step  9 . If fuel pump relay does not click, go to next step.
  4. Turn ignition off. Disconnect fuel pump relay located in underhood accessory wiring junction block. Turn ignition on. Using test light connected to ground, probe fuel pump relay control circuit at relay cavity. Using scan tool, command fuel pump on. If test light turns on and off, go to next step. If test light does not turn on and off, go to step  6 .
  5. Connect test light between fuel pump relay control circuit and fuel pump relay ground circuit at relay cavities. Using scan tool, command fuel pump on. If test light turns on and off, go to step  19 . If test light does not turn on and off, go to step  22 .
  6. If test light remains illuminated, go to next step. If test light does not remain illuminated, go to step  8 .
  7. Disconnect PCM. Check fuel pump relay control circuit for short to voltage. Repair as necessary. After repairs, go to step  27 . If circuit is okay, go to step  26 .
  8. Disconnect PCM. Check fuel pump relay control circuit for open or short to ground. Repair as necessary. After repairs, go to step  27 . If circuit is okay, go to step  20 .
  9. Turn ignition on. If fuel pump runs continuously, go to next step. If fuel pump does not run continuously, go to step  11 .
  10. Turn ignition off. Disconnect fuel pump relay located in underhood accessory wiring junction block. Turn ignition on. If fuel pump runs continuously, go to step  21 . If fuel pump does not run continuously, go to step  25 .
  11. Check F/PMP fuse (15-amp) located in underhood accessory wiring junction block. If fuse is open, go to next step. If fuse is okay, go to step  14 .
  12. Remove fuel pump access panel (if equipped; fuel tank may need to be lowered). Check for short to ground in fuel pump power feed circuit between fuel pump and fuse. Repair as necessary. After repairs, go to step  27 . If circuit is okay, go to next step.
  13. Reconnect all components. Install NEW F/PMP fuse. Using scan tool command fuel pump on. If fuse blows, go to step  24 . If fuse does not blow, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article.
  14. Turn ignition off. Disconnect fuel pump relay located in underhood accessory wiring junction block. Turn ignition on. Using test light connected to ground, probe fuel pump relay battery feed circuit at fuel pump relay cavity. If test light illuminates, go to next step. If test light does not illuminate, go to step  23 .
  15. Connect fused jumper wire between fuel pump relay battery feed circuit and fuel pump power feed circuit at fuel pump relay cavities. If fuel pump runs, go to step  19 . If fuel pump does not run, go to next step.
  16. Remove fuel pump access panel. Check fuel pump power feed circuit for open or high resistance between fuel pump and fuel pump relay. Repair as necessary. After repairs, go to step  27 . If circuit is okay, go to next step.
  17. Check fuel pump ground circuit for open or high resistance. Repair as necessary. After repairs, go to step  27 . If circuit is okay, go to next step.
  18. Check for poor connections at fuel pump. Repair as necessary. After repairs, go to step  27 . If connections are okay, go to step  24 .
  19. Check for poor connections at fuel pump relay. Repair as necessary. After repairs, go to step  27 . If connections are okay, go to step  25 .
  20. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  27 . If connections are okay, go to step  26 .
  21. Repair short to voltage in fuel pump power supply circuit. After repairs, go to step  27 .
  22. Repair open in fuel pump relay ground circuit. After repairs, go to step  27 .
  23. Repair fuel pump relay battery feed circuit. After repairs, go to step  27 .
  24. Replace fuel pump. Replace F/PMP fuse (15-amp) if necessary. After repairs, go to step  27 .
  25. Replace fuel pump relay. After repairs, go to step  27 .
  26. Replace PCM. Perform PCM relearn procedures. After repairs, go to next step.
  27. Operate system and verify repair. If system operation is okay, testing is complete. If system operation is not okay, go to step  2 .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.